/Engine/Plugins/Animation/DeformerGraph/Source/OptimusCore/Public/OptimusNodeGraph.h
Take a function or subgraph node and expand it in-place, replacing the given function node. The function definition still remains, if a function node was expanded. If a sub-graph was expanded, the sub-graph is deleted.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=OptimusNodeGraph) [TArray](API\Runtime\Core\Containers\TArray)< [UOptimusNode](API\Plugins\OptimusCore\UOptimusNode) * > ExpandCollapsedNodes ( [UOptimusNode](API\Plugins\OptimusCore\UOptimusNode) * InFunctionNode )